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I was gifted a Polkaudio subwoofer and I currently have a Sonos Beam, One and a Move. Do I need anything to make the sub work with existing speakers? I am thinking about getting a Port so I can hook up my turntable. Will that be enough?

Assuming the Polk is self powered, you would need a Sonos device with a subwoofer output. Currently, the only one is the Amp, which would normally power a pair of your own speakers in addition. 

Important to note that you can’t use a third party sub with the TV input on the Beam, however it will work fine for music streaming. 

In your case, the Amp also has an analog input that you could connect your turntable to, so you could use it instead of the Port.